123. At present nanotechnology(纳米技术), a kind of tip scienceto the common people. Few peopl

发布时间：2020-08-16 06:39:41


123. At present nanotechnology(纳米技术), a kind of tip science    to the mon people. Few people know him.
A. unknowing
B. unknown
C. known
D. Untrue

网友回答

A. unknowing
(答案→)B. unknown
C. known
D. Untrue
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